İlhami HORUZ, Ahmet Bilge UYGUR, Cem ÖMÜR

OLUK TASARIMINDA ÜRETİMSEL KISITLARIN ETKİSİ VE BUNUN ISI BORULARININ ISI TAŞIMA KAPASİTESİNİ BELİRLEMEDE KULLANILAN BİR ALGORTİMAYA UYGULANIŞI

Bu çalışmada, oluklu ısı boruları için maksimum ısı taşıma kapasitesinin hesaplamasına yönelik bir yöntem üzerinde durulmuştur. Yöntem, ekstrüzyon kısıtları, ısı borusu boyunca buhar ve sıvıda görülen basınç kayıplarına ek olarak buharlaştırıcı ve yoğuşturucu arasındaki sıcaklık düşüşünü de göz önünde bulundurmaktadır. Yöntemin bir algoritmaya uygulanışı ve öngörüsel başarımı, dikdörtgen, ikizkenar yamuk, ikizkenar üçgen ve girintili oluk şekillerine sahip ısı boruları için belli bir alan ve çalışma sıcaklığında gösterilmiştir. Bu çalışma sonucunda, girintili oluk tipinin diğer tiplere göre daha fazla ısı taşıma kapasitesine sahip olduğu görülmüştür. Anahtar Kelimeler: Oluklu ısı borusu, Ekstrüzyon limitleri, Kılcal ısı transfer

THE EFFECT OF MANUFACTURING LIMITATIONS ON GROOVE DESIGN AND ITS IMPLEMENTATION TO AN ALGORITHM FOR DETERMINING HEAT TRANSPORT CAPABILITY OF HEAT PIPES

: In this study, a methodology for the computation of maximum heat transport capability of grooved heat pipesis presented. The methodology takes into account extrusion limitations together with the vapor, liquid pressure lossesalong the heat pipe, the temperature drop between evaporator and condenser. The implementation of the methodologyto an algorithm and its predictive performance was demonstrated on rectangular, trapezoidal, triangular and re-entrantgrooved heat pipes for a specific allowable space and working temperature. It was seen that the heat pipe with re-entrantgroove is superior to other geometries in terms of heat transport capacity.

PDF

___

Zohuri B., 2016, Heat Pipe Design and Technology, Modern Applications for Practical Thermal Management (2nd Ed.), Spinger, Switzerland.
Vlassov V. V., Sousa F. L. and Takahashi W. K., 2006, Comprehensive optimization of a heat pipe radiator assembly filled with ammonia or acetone, Int. J. Heat and Mass Transfer, 49, 4584–4595.
Suman B. and Hoda N., 2005, Effect of variations in thermos-physical properties and design parameters on the performance of a v-shaped micro grooved heat pipe. International Journal of Heat and Mass Transfer, 48, 2090-2101.
Suh J. S. and Park Y. S., 2003, Analysis of thermal performance in a micro flat heat pipe with axially trapezoidal groove, Tamkang Journal of Science and Engineering, 6, 4, 201–206.
S.K. Thomas and V.C. Damle, 2005, Fluid flow in axial reentrant grooves with application to heat pipes, J. Thermophys. Heat Transfer, 19,395–405.
Shah R.K., 1975, Laminar flow friction and forced convection heat transfer in ducts of arbitrary geometry, Int. J. Heat and Mass Transfer,18, 849-862.
Reay D. and Kew P., 2013, Heat Pipe Theory, Design and Applications (6th Ed.), Butterworth-Heinemann, MA. Saha P. K., 2002, Aluminum Extrusion Technology, ASM International, Ohio.
Muzychka, Y. S. and Yovanovich M. M., 2002, Laminar Flow Friction and Heat Transfer in Non-Circular Ducts and Channels: Part I—Hydrodynamic Problem, Compact Heat Exchangers: A Festschrift on the 60th Birthday of Ramesh K. Shah, Grenoble, France.
Muzychka Y.S. and Yovanovicht M.M., 2004, Laminar Forced Convection Heat Transfer in the Combined Entry Region of Non-Circular Ducts, Transactions of the ASME, 126, 54-61.
Lips S., Lefèvre F. and Bonjour J., 2010, Combined effects of the filling ratio and the vapor space thickness on the performance of a flat plate heat pipe, International Journal of Heat and Mass Transfer, 53, 694-702.
Lefèvre F., Rullière R., Pandraud G. and Lallemand M., 2008, Prediction of the temperature field in at plate heat pipes with micro-grooves-experimental validation. International Journal of Heat and Mass Transfer, 51, 4083-4094.
Launay S., Sartre V. and Lallemand M., 2004, Hydrodynamic and thermal study of a water-filled microheat-pipe array, Journal of Thermophysics and Heat Transfer, 18(3), 358-363.
Kotcioğlu İ., Çalışkan S. and Manay E., 2009, Cooling of a CPU with heat pipes using different refrigeration fluids, J. of Thermal Science and Technology, 29, 2, 109-116.
Kim S. J., Seo, J. K., and Do, K. H., 2003, Analytical and Experimental Investigation on the Operational Characteristics and the Thermal Optimization of a Miniature Heat Pipe with a Grooved Wick Structure, International Journal of Heat and Mass Transfer, 43, 2051–2063.
Kamotani Y., 1978, Evaporator film coefficients of grooved heat pipes, 3rd International Heat Pipe Conference.
Brennan J.P. and Kroliczek E. J., 1979 Heat Pipe Design Handbook, Volume 1, B&K Engineering, Maryland. Chen Y., Zhang C., Shi M., Wua J. and Peterson G.P., 2009, Study on flow and heat transfer characteristics of heat pipe with axial ‘‘Ω”-shaped microgrooves, International Journal of Heat and Mass Transfer, 52, 636– 643.
Bauser M., Sauer G. and Siegert K., 2006, Extrusion (2nd Ed.). ASM International, Ohio.
Babin B.R., Peterson G.P. and Wu D., 1989, Analysis and testing of a micro heat pipe during steady-state operation, Proceedings of ASME/AIChE National Heat Transfer Conference, 89-HT-1, Philadelphia, Pennsylvania.
Asselman G. A. A. and Green D. B., 1982, Heat Pipes, Phillips Technical Review, 16, 169-186.